FEATURES:-Direct replacement of factory 4.25″ barrel-Improves accuracy-Optimal performance seen w/ bullet weights of 115gr through 147gr. using 9mm jacketed ammunition-Due to variations in factory slide tolerances, slight fitting may be required & is easily performed by the end user-Works w/ all Smith & Wesson 9mm M&P pistols, including the M&P M2.0, requiring a 4.25″ barrel